This design:
http://www.audiodesignguide.com/VolumeNew/index.html
HQ-R/2R VOLUME Technical Specifications:
Specifications:
– low tolerance 0.1% R-2R network with melf resistors ( resistors in parallel produce a pure resistor).
– attenuation in 64 steps - each step 1dB
– Input resistance ranges from 20k to 47K for a Rload of 47K.
– Output resistance ranges from 22K to 47K.
– 3 selectable inputs with option to edit input name
– one direct input
– display back-light programmable On/Off - if Off timeout 10s
- 20X 4 display characters for wide view
– tube menu for delaying plate voltage
- 3-modules design: Powers Supply (PS), Control and Display Unit (CDU), Relay Module (RM) in SE or Balanced modification.
-Volume attenuation by rotating optical encoder or from IR remote control.
- Input selection by rotating optical encoder or from IR remote control
- Display auto dimming with adjustable brightness level
- ONE open collector outputs for power On/Off and tube plate delay
- Main AC power on/off control
– AC power consumption, Max. 6W.
Special : The avoidance of clicks is the major improvement with respect to my original attenuator design of several years back.
in most of the design volume -32db relay at transition to -31dB, the relay volume 64 steps are emitting huge sound in the speakers, causing discomfort, not safe for the system.
I definitely settle this phenomenon, therefore, very smooth transition Volume and sound great.
This link for Video of Volume: https://www.youtube.com/watch?v=s9QEZduZavs
this complete module assembled including the aluminium remote at 250$ + shipping.
thanks
please see some other designs:
The δ1 relay-based R-2R stereo attenuator
Audio Volume Relay Attenuator with IR Control
VC-03 Volume Control
http://www.audiodesignguide.com/VolumeNew/index.html
HQ-R/2R VOLUME Technical Specifications:
Specifications:
– low tolerance 0.1% R-2R network with melf resistors ( resistors in parallel produce a pure resistor).
– attenuation in 64 steps - each step 1dB
– Input resistance ranges from 20k to 47K for a Rload of 47K.
– Output resistance ranges from 22K to 47K.
– 3 selectable inputs with option to edit input name
– one direct input
– display back-light programmable On/Off - if Off timeout 10s
- 20X 4 display characters for wide view
– tube menu for delaying plate voltage
- 3-modules design: Powers Supply (PS), Control and Display Unit (CDU), Relay Module (RM) in SE or Balanced modification.
-Volume attenuation by rotating optical encoder or from IR remote control.
- Input selection by rotating optical encoder or from IR remote control
- Display auto dimming with adjustable brightness level
- ONE open collector outputs for power On/Off and tube plate delay
- Main AC power on/off control
– AC power consumption, Max. 6W.
Special : The avoidance of clicks is the major improvement with respect to my original attenuator design of several years back.
in most of the design volume -32db relay at transition to -31dB, the relay volume 64 steps are emitting huge sound in the speakers, causing discomfort, not safe for the system.
I definitely settle this phenomenon, therefore, very smooth transition Volume and sound great.
This link for Video of Volume: https://www.youtube.com/watch?v=s9QEZduZavs
this complete module assembled including the aluminium remote at 250$ + shipping.
thanks
please see some other designs:
The δ1 relay-based R-2R stereo attenuator
Audio Volume Relay Attenuator with IR Control
VC-03 Volume Control
Attachments
Last edited:
This seems to be a good option for my GM preamp clone, what is the size of the LCD display? I have a Chassis but I want to know if the display will fit on the front panel.
Hi
1. Understand that there's a power on delay build inn. What is the time frame & is this adjustable ?
2. Possible to link the power on to power amp as well ?
3. What is the actuall price of the complete unit as I see $200 n $ 250
Thks
1. Understand that there's a power on delay build inn. What is the time frame & is this adjustable ?
2. Possible to link the power on to power amp as well ?
3. What is the actuall price of the complete unit as I see $200 n $ 250
Thks
Hi Jaffrie!
1. Understand that there's a power on delay build inn. What is the time frame & is this adjustable ?
The delay turn on for amplifier about 5s
The delay for the output about 10s
2. Possible to link the power on to power amp as well ?
yes, can use for your amplifier , but the relay on about 5A to 8A ( you can use other relay if your amplifier need big current )
3. What is the actuall price of the complete unit as I see $200 n $ 250
Price 250$ + shipping!
thanks
quanghao
1. Understand that there's a power on delay build inn. What is the time frame & is this adjustable ?
The delay turn on for amplifier about 5s
The delay for the output about 10s
2. Possible to link the power on to power amp as well ?
yes, can use for your amplifier , but the relay on about 5A to 8A ( you can use other relay if your amplifier need big current )
3. What is the actuall price of the complete unit as I see $200 n $ 250
Price 250$ + shipping!
thanks
quanghao
Thanks for the reply. Can the delay to programme for long power on time ?
Building an hybrid amp so need tube stage to be dc free before Ss amp stage powers on.
Also whats your paypal account
Thks
Building an hybrid amp so need tube stage to be dc free before Ss amp stage powers on.
Also whats your paypal account
Thks
Hey Quanghao
Awaiting for your reply. Wanted to order this item but in your webshop I only see an remote
listed at 199.99 is this the item ?
Awaiting for your reply. Wanted to order this item but in your webshop I only see an remote
listed at 199.99 is this the item ?
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